Pmoto-uthuj



(No Model.)

G. H. MORAN. GOASTING SPROOKET WHEEL.

N0r5913082. Patented Oct. 5,1897.

WITNESSES 4Q/ nf\\ l mmm Arron/verf,

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NIED STATES PATENT OFEicE.

GEORGE HENRY MORAN, OF NEW YORK, N. Y.

COASTING YSPROCKET-WHEEL.

SPECIFICATION forming part of Letters Patent No. 591,082, dated October 5, 1897. Application iled November 17, 1896. Serial No. 612,451. (No model.)

To a/ZZ whom t may concer-n,.-

Beit known that I, GEORGE HENRYMORAN, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Coasting Sprocket- Wheels, of which the following is a full and complete specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relatesto sprocket-wheels such as are usually7 employed lin connection with bicycles and similar vehicles; and the object thereof is to provide an improved sprocket-wheel of this class which is provided with a central circular portion on whichis mounted a revoluble rim provided with sprocket-teeth, said rim and said central circular portion being provided with means for locking the parts together when the shaft on which the wheel is mounted is revolved, and whereby when the shaft is held stationary the rim will revolve on the central circular portion.

The invention is fully disclosed in the following specification, of which the accompanying drawings form a part, in which- Figure 1 is a plan view of my improved sprocket-wheel; Fig. 2, a side view showing one of the sides of the central circular portion removed, and Fig. 3 a transverse section on the line 3 3 of Fig. 1.

In the drawings forming part of this speciiication the separate parts of my improvement are designated by the same numerals of reference throughout the several views, and inthe practice of my invention I pro vide a sprocket-wheel which comprises a central circular portion which consists of two circular disks 5, which are secured together by transversepins or bolts 6, any desired number of which may be employed.

The circular disks 5 are preferably provided with openings 7, so as'to decrease the weight of the wheel, but said disks may be formed solid, if desired, and each is provided with a central circular .opening 8, through which the pedal. or other shaft passes and to which the Wheel is secured. I also provide a revoluble rim 10, which incloses the disks 5 and which is provided centrally of its inner side with an inwardly-directed annular flange 11, which fits between the perimeters of the disks 5, and said rim 10 is provided on its outer side with sprocket-teeth 12 of the usual form.

Formed in the inwardly-directed annular flange 11 on the rim 10 of the sprocket-wheel are triangular notches or recesses 13, eight of which are shown, and by means of these triangular notches or recesses a corresponding number-of inwardly-directed teeth or projections let are formed, which are also substantially triangular in form, the longer sides thereof being segmental in form or slightly curved. Ialso mount between the disks 5 a central disk 15,'which is of such diameter as to fill the space between the inwardly-directed teeth or projections 14 on the rim 10, and said wheel 15 is rigidly secured to the disks 5 and is also preferably provided with openings 16, similar to the opening 7 in the disks 5, and formed in the perimeter thereof at regular intervals are triangular notches or recesses 17, which correspond with openings 18, formed in the disks 5.

Pivoted to the wheel 15, adjacent to the perimeter thereof, are a plurality of dogs 19, which are adapted to occupy the space 17 and to be thrown out into the triangular notches or recesses 13 in the inwardly-directed annular iiange l1 of the wheel 10, and mounted on the pivot-pins by which the dogs 19 are connected with the wheel 15 are springs 20, which are designed to .throwr said dogs outwardly into said notches or recesses 13.

In practice the wheel is revolved in the direction of the arrow shown in Fig. 2 by means of the shaft on which it is mounted and to which it is secured, and in this operation the dogs 19 will be thrown outwardly and engage with the notches or recesses 13 in the annular flange 11 of the rim 10, and said rim will be revolved with the wheel; but whenever it is desired for the rim to revolve without the shaft or the body portion of the wheel all that is necessary is to hold the shaft stationary, and -in` this operation said rim will be revolved by the drive-chain mounted thereon, which is not shown, and in this operation the dogs 19 will be thrown inwardly, the segmental or curved surfaces of the teeth or projections 14 passing thereover, as will be readily understood.

IOO

My improved sprocket-wheel is particularly adapted for use on the pedal-shafts of bicycles and similar vehicles, and by means thereof the operation of coasting may be per'- formed by simply holding the pedals and pedal-shaft stationary with the feet.

The object of forming the central portion of the wheel as herein described is to be enabled to make the same as light as possible; but it will be apparent that changes in and modifications of the construction herein described may be made without departing from the spirit of my invention, and, if desired, the entire central portion of the wheel may be formed of a single piece, all that is necessary being to form an annular groove in the perimeter thereof and to form the notches or recesses therein and to pivot the dogs in said notches or recesses, as herein described.

Having fully described my invention, l claim as new and desire to secure by Letters Patent- The herein-described sprocket-wheel comprising a central circular portion consisting of two disks 5, secured together by bolts 6,

and provided with a central circular opening 8, a revoluble rim l0, mounted on said disks, having a iiange 11, being provided with notches 13, and a corresponding number of projections 14, a supplemental disk 15, mounted between the disks 5 and rigidly secured thereto, said supplemental disk being provided with notches 17, said disk 5 being provided with a corresponding number of openings 18, said supplemental disk being also provided with a plurality of dogs pivotally connected therewith, and adapted to occupy notches 17, and to be thrown into engagement all substantially as shown and for the purpose set forth.

In testimony that I claim the foregoing as my invention l have signed my name, in presence of the subscribing witnesses, this 12th day of November, 1896.

GEORGE HENRY MORAN.

Witnesses:

JOHN J. CAssIDY, WILLIAM ATKINSON.

l' with the said notches 13, said dogs being provided with springs 2O for actuating the same, 

